.github: add pull request and issue templates radondb#90

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: 'Bug Report'
+about: 'Report unexpected behavior to help us improve.'
+labels: 'bug'
+---
+
+**Describe the problem**
+
+<!-- Please describe the issue you observed, and any steps we can take to reproduce it: -->
+
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+**To Reproduce**
+
+<!-- What did you do? Describe in your own words. -->
+
+<!-- If possible, provide steps to reproduce the behavior: -->
+
+1.
+
+**Expected behavior**
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+**Environment:**
+- Kubernetes version [e.g. v1.19.5]
+- Helm version [e.g. v3.4.2]
+- RadonDB MySQL version [e.g. https://github.com/radondb/radondb-mysql-kubernetes/commit/56896cd119d9a6017e7f15f1dc0b37b83a720278]

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: 'Feature Request'
+about: 'Request a new feature on the product.'
+labels: 'enhancement'
+---
+
+**Is your feature request related to a problem? Please describe.**
+<!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
+
+**Describe the solution you'd like**
+<!-- A clear and concise description of what you want to happen. -->
+
+**Describe alternatives you've considered**
+<!-- A clear and concise description of any alternative solutions or features you've considered. -->
+
+**Additional context**
+<!-- Add any other context or screenshots about the feature request here. -->

.github/ISSUE_TEMPLATE/general-question.md

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+---
+name: 'Ask a Question'
+about: 'Need support & not sure if this a bug? You can ask a question.'
+labels: 'question'
+---
+
+## General Question
+
+<!--
+
+Before asking a question, make sure you have:
+
+- Searched existing Stack Overflow questions.
+- Googled your question.
+- Searched open and closed [GitHub issues](https://github.com/radondb/radondb-mysql-kubernetes/issues?q=is%3Aissue)
+- Read the documentation:
+  - [RadonDB MySQL Readme](https://github.com/radondb/radondb-mysql-kubernetes)
+  - [RadonDB MySQL Doc](https://github.com/radondb/radondb-mysql-kubernetes/tree/main/docs)
+  - [RadonDB MySQL Forum](https://kubesphere.com.cn/forum/t/RadonDB)
+-->

.github/ISSUE_TEMPLATE/support-request.yml

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+contact_links:
+  - name: Support Request
+    url: https://kubesphere.com.cn/forum/t/RadonDB
+    about: Support request or question relating to RadonDB MySQL.

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Thanks for sending a pull request!
+
+PR Title Format:
+1. pkg [, pkg2, pkg3]: what's changed #xxx
+2. *: what's changed #xxx
+
+-->
+
+### What type of PR is this?
+
+<!--
+Add one of the following types:
+/bug
+/documentation
+/cleanup
+/enhancement
+-->
+
+### Which issue(s) this PR fixes?
+
+<!--
+*Automatically closes linked issue when PR is merged.
+Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
+-->
+Fixes #
+
+### What this PR does?
+
+Summary:
+
+### Special notes for your reviewer?